Well there's no way this stuff is compatible. Imagine throwing a bunch of zirconia into your melt! The color is beatiful though. I'm probably going to have to melt my own custom clear and offset the expansion if I want to do it this way. I might hit you up for some advice Pete.

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Two inches is rather huge. You'll never make a Hagy seal out of it that survives nor will a ring test do anything. I could take a cane 4mm (pencil lead size) diameter and make a run at the dilatometer but I would bet on something in the mid eighties.
This is where it gets hard using cullet, crushed or whatever. It's really hard to add stuff to cullet and remain accurate or not cording it up. If you do try, use potassium or lithium . They'll do different things. Potassium is kind to the color but doesn't move expansion as easily and Lithium will move expansion and make it kind of cordy.
This sort of stuff is likely easier in Boro since it hardly expands in the first place although lithium would wreck it.
Rather than to try to make a clear that's not compatible with the known world, I'd be more inclined to make a conventional assault on the color.

A custom clear with an offset expansion would be the way to go. This doesn't work with batch.

This is after 24 hours in the pot. Again, the pictures don't capture how nice this stuff is. It was the only one I could get out today, the barlett controller decided it didn't want to clear its error message so things are coming down as we speak.

It really looks nice but I suspect a moving target. Keep in mind you can get there with excess amounts of cadmium. That pushes the opacity. I suppose I prefer it when everything is compatible with ever thing else.

A custom clear with an offset expansion would be the way to go. This doesn't work with batch.

This is after 24 hours in the pot. Again, the pictures don't capture how nice this stuff is. It was the only one I could get out today, the barlett controller decided it didn't want to clear its error message so things are coming down as we speak.

Is that straight out of the pot , or did you have to strike it? Nice color!

I'm under the impression that Denver Fire Clay was absorbed by Coors and markets as Coorstek out of Golden. Assay crucibles are certainly a great deal for experiments. They leach a lot of iron making use for clear not good and don't last long but as a throwaway, it's nice.

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